Officials are probing how a 51-year-old highway bridge came to collapse in the Italian port city of Genoa yesterday, killing at least 26 people and injuring 16 others as it sent dozens of vehicles tumbling into a heap of concrete and twisted steel.

Bittersweet Big Freeze as Daniher prepares to hand over the reins

AFL icon Neale Daniher has united all 18 coaches for this year’s Big Freeze for Motor Neurone Disease.

Putting aside any egos and rivalries, there were costumes and wigs to boot at the MCG this morning as the game’s legends prepared to dive into zero-degree temperatures for a good cause.

Sydney Swans coach John "Horse" Longmire dressed as a jockey, Alastair Clarkson from Hawthorn wore a horse mask in reference his mate and occasional sparring partner, and twin brothers Chris and Brad Scott had the crowd seeing double.

Legend Neale Daniher united all 18 AFL coaches today for a great cause. (9NEWS) (9NEWS)Sydney Swans coach John "Horse" Longmire looked "giddy" as he slid into the icy water below. (9NEWS) (9NEWS)The Big Freeze has raised millions over the past four years. Pictured: Essendon coach John Worsfold. (9NEWS) (9NEWS)

But the outfit that captured the heart of the day perfectly was worn by Nathan Buckley: a firefighting helmet worn by MND sufferer Murray Swinton.

“This is the helmet he wore for 30 years, I’d like to acknowledge him,” Buckley said.

Mr Swinton said it was an “honour” to see the former Collingwood player and current coach wear his uniform.

“When he rang me at home and asked me if he could do it (wear the helmet), I just started crying.”

It will likely be the last year Daniher is front and centre at the Freeze. (9NEWS) (9NEWS)